An increasing number of patients with ruptured disc of the neck and "whiplash" injury are being treated by halter traction. For this purpose a device which can be readily adjusted to give reasonably accurate, measurable increments of pull, which is simple to set up and to use, and which is completely under the control of the patient is highly desirable.
Consistently good results can be expected only if the attending physician has an apparatus that he can depend upon to give the pull he prescribes. For many afflictions of the neck it has been found that 25 lb. of vertical traction is the minimum required to produce symptomatic relief. Yet, the small 1- to 2-in. pulleys generally in use have been found by actual test to be 10% to 50% erratic. The smaller the pulley, the less dependable it was. The troughs or grooves of these small pulleys were often
CHAMBERS WR. Improved Apparatus for Halter Traction. AMA Arch Surg. 1956;72(4):715–718. doi:10.1001/archsurg.1956.01270220163021